Blowoff cock



D. A. KELLY BLOW-OFF COCK Oct. 30, 1945.

Filed NOV. 20, 1944 II III/ [III INVENTOR DANIEL ALLCOTT KELLY ATTORNEYSPatented Oct. 30, 1945 BLOWOFF COCK Daniel AllcottKelly, Milwaukee, Wis,assignorrto :Prime .Manufacturing Wis.

Company, Milwaukee Application November 20, 1944,8erial 564,236

2 Claim s. icl. 137-139) This invention appertains to"valv es and moreparticularly a novel blow-off cock forxthe boilers of steam locomotives.7

One of the primary objects of my invention is to provide a blow-ofi cock"having incorporated therewith a pressure operating mechanism -for thevalve thereof, the arrangement being such that a compact structure willbehad which will not project an objectionable distance from the H Afurther object of my invention is to provide,

a pressure operated blow-off cock embodying an operating piston andcylinder forthe valve carried by the cock casing,but having nocommunication therewith, whereby danger of leakage of a water andsediment from the boiler to the cylinder is eliminated.

A further important object of my invention is to provide a pressureoperated blow-off cock having formed directly on the casing thereofdiametrically opposite the discharge nipple, an internally threaded bossor flange for receiving the cylinder .for the operating piston of thevalve, the casing having a passagewa and port therein for the admittanceof pressure to the inner end of the cylinder.

A still further object of my invention is to provide a pressure operatedblow-ofi cock of the above character, which will be durable andefiicient in use, one that will be simple and easy to manufacture andone which can be placed upon the market at a reasonable cost.

With these and other objects in View the invention consists in the novelconstruction, arrangement and formation of parts, as will be hereinaftermore specifically described, claimed, and illustrated, in theaccompanying drawing, in rrhich drawing:

Figure 1 is a vertical longitudinal sectional vi w through m improvedblow-off cock showing the same associated with a boiler.

Figure 2 is an end elevational view of the blowoff cock with partsthereof broken away and in section to illustrate structural detail.

Referring to the drawing, in detail, wherein similar referencecharacters designate corresponding parts throughout the several viewsthe letter C generall indicates my improved blowoff cock for a boiler B.

Only a fragment of the boiler has been shown and the'part illustratedmaybe considered-as the boiler sideplate. v

The blow-off cock C includes a casing 5 cmbodying a substantiallycylindrical bodyp'ortionli and a depending discharge nipple' 'l, theforward end of the body pfortionfi istapered and jis'exfternallythreaded as at B This threaded body portion 6 receives acoupling 'sleevef'l! "having formed on itsiorwardend a valve seat l0.'A'preforated strainer cap l| can "be 'threaded'on the forward end ofthe coupling sleeve. This cap at a central portion can be provided withavalve stem guide 12' l In order, to facilitate the connection of theblow-on? cock withithe boiler 13 1 provide a union 'nut is which isadapted'to bethreadeddirectly into the side of the boiler and this unionnut and "the coupling sleeve 9 are provided with mating coarse threadsand obviously the blow-off cock can be quickly threade'd'into theunionnut.

In order to prevent leakage, the coupling sleeve 9 is provided with anannular flange I4 and this flange carries a gasket [5 for snugengagement with the outer face of the union nut.

Slidably mounted within the casing body is a valve stem I5 and this stemhas formed thereon or secured thereto a valve body IB which is adaptedto fit upon the valve seat Ill. The forward end of the valve stem isslidably received within the valve guide l2 and the opposite end of thestem extends through a packing gland I! carried by the casing.

The protruding end of the valve stem is reduced in diameter to form astop shoulder I8. Fitted on the valve stem against the shoulder I8 is astop washer IS. A spacing sleeve 20 is then fitted on the valve stemagainst the stop Washer and a second stop washer 2| is fitted againstthe spacing sleeve. This assembly can be held on the valve stem by a nut22.

In order to operate the valve, I provide an operating lever 23. Thislever is rockably mounted intermediate its ends on a pivot pin 29carried by a bracket 25. This bracket is preferably formed directly onthe valve casing. The inner end of the operating lever is bifurcated toform a yoke 25 and this yoke straddles the valve stem and is confinedbetween the stop washers l9 and 2!. The opposite end of the lever isprovided with an arcuate operating arm 21 which extends over the valvecasing.

In accordance with my invention I cast directly on the body portion 6 ofthe valve casing an annular flange or boss 28. This flange or boss isdisposed directly diametrically opposite the discharge nipple 1 and isinternally threaded for the reception of a cylinder 29. Hence thecylinder is carried directly by the valve casing and it is to be notedthat the inner end of the cylinder is closed by the valve casing andthat the outer end of the cylinder is closed by a wall 30 which can beformed integral with the cylin der. This outer wall 30 is apertured fora piston rod 3|. The inner end of'the piston rod carries the operatingpiston 32. The outer end of the piston rod is slotted for the receptionof the operating handle 27 of the lever 23.

An expansion spring 33 is coiled about the valve stem 15 and the springis confined between the valve casing and the stop washer l9. Hence thespring 33 functions to normally hold the valve body I6 on its seat It].When the piston 32 is moved outwardly, the lever 23 will be operated tomove the stem l5 and the valve body I 6 inwardly, and the valve bodywill be forced off of its seat allowing the blowing off of the boiler.

The valve casing 5 is transversely bored to provide a fluid passageway34 and this passageway is connected with the inner end of the cylinderby means of a port 35. One end of the passageway 34 is closed by aclean-out plug 36 and the opposite end of the passageway has threadedtherein a conduit pipe or tube 31.

The pipe 31 conducts fluid under pressure to the inner end of thecylinder. This fluid can be compressed air or steam and is under thecontrol of the engineer by means of a valve (not shown) located in theengineer's cab.

From foregoing description it can be seen that I have provided anexceptionally simple and durable form of blow-01f cock which can beoperated by air pressure;

Changes in detail may be made without departing from the spirit or thescope of the claims, but what I claim as new is:

1. A blow-01f cock for steam boilers comprising a valve casing having alongitudinally extending body and a right angularly disposed dischargenipple, an internally threaded annular flange formed on the valvecasing, a cylinder having its outer end closed threaded into saidflange, the inner end of said casing having a valve seat, a valve forsaid seat, spring means normally holding the valve on its seat, a leverfor operating said valve against the tension of the spring, an operatingpiston slidably mounted in the cylin der having operative connectionwith the lever, and said casing having a passageway therein for fluidunder pressure and a port connecting said passageway with the inner endof the cylinder.

2. A blow-oil? cock comprising a valve casing having a longitudinallyextending body and an angularly disposed discharge nipple, the inner endof said body being externally threaded, a coupling sleeve threaded onsaid body having a valve seat on its inner end, a strainer cap threadedon said sleeve having a guide boss, said sleeve being provided withexternal threads for connection with a boiler, a valve stem slidablymounted in said boss and in said casing having a valve body thereon forthe seat, and means including an operating lever for actuating the valveand stem, an annular flange formed on the casing, a cylinder having itsouter end closed threaded into said flange, a piston slidably mounted inthe cylinder, a piston rod for the piston slidably extending through theclosed end of the cylinder, said piston rod having its outer endslotted, said operating lever including an arcuate arm fitted in theslotted portion of the piston rod, and said valve casing having apassageway for fluid under pressure and a port connecting saidpassageway with the inner end of the cylinder.

DANIEL ALLCOTT KELLY.

